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extern crate salsa;
use std::{
sync::Arc,
collections::hash_map::{HashMap, DefaultHasher},
any::Any,
hash::{Hash, Hasher},
};
type State = HashMap<u32, String>;
const GET_TEXT: salsa::QueryTypeId = salsa::QueryTypeId(1);
const GET_FILES: salsa::QueryTypeId = salsa::QueryTypeId(2);
const FILE_NEWLINES: salsa::QueryTypeId = salsa::QueryTypeId(3);
const TOTAL_NEWLINES: salsa::QueryTypeId = salsa::QueryTypeId(4);
fn mk_ground_query<T, R>(
state: &State,
params: &(Any + Send + Sync + 'static),
f: fn(&State, &T) -> R,
) -> (Box<Any + Send + Sync + 'static>, salsa::OutputFingerprint)
where
T: 'static,
R: Hash + Send + Sync + 'static,
{
let params = params.downcast_ref().unwrap();
let result = f(state, params);
let fingerprint = o_print(&result);
(Box::new(result), fingerprint)
}
fn get<T, R>(db: &salsa::Db<State>, query_type: salsa::QueryTypeId, param: T) -> (Arc<R>, Vec<salsa::QueryTypeId>)
where
T: Hash + Send + Sync + 'static,
R: Send + Sync + 'static,
{
let i_print = i_print(¶m);
let param = Box::new(param);
let (res, trace) = db.get(salsa::QueryId(query_type, i_print), param);
(res.downcast().unwrap(), trace)
}
struct QueryCtx<'a>(&'a salsa::QueryCtx<State>);
impl<'a> QueryCtx<'a> {
fn get_text(&self, id: u32) -> Arc<String> {
let i_print = i_print(&id);
let text = self.0.get(salsa::QueryId(GET_TEXT, i_print), Arc::new(id));
text.downcast().unwrap()
}
fn get_files(&self) -> Arc<Vec<u32>> {
let i_print = i_print(&());
let files = self.0.get(salsa::QueryId(GET_FILES, i_print), Arc::new(()));
let res = files.downcast().unwrap();
res
}
fn get_n_lines(&self, id: u32) -> usize {
let i_print = i_print(&id);
let n_lines = self.0.get(salsa::QueryId(FILE_NEWLINES, i_print), Arc::new(id));
*n_lines.downcast().unwrap()
}
}
fn mk_query<T, R>(
query_ctx: &salsa::QueryCtx<State>,
params: &(Any + Send + Sync + 'static),
f: fn(QueryCtx, &T) -> R,
) -> (Box<Any + Send + Sync + 'static>, salsa::OutputFingerprint)
where
T: 'static,
R: Hash + Send + Sync + 'static,
{
let params: &T = params.downcast_ref().unwrap();
let query_ctx = QueryCtx(query_ctx);
let result = f(query_ctx, params);
let fingerprint = o_print(&result);
(Box::new(result), fingerprint)
}
fn mk_queries() -> salsa::QueryConfig<State> {
salsa::QueryConfig::<State>::new()
.with_ground_query(GET_TEXT, |state, id| {
mk_ground_query::<u32, String>(state, id, |state, id| state[id].clone())
})
.with_ground_query(GET_FILES, |state, id| {
mk_ground_query::<(), Vec<u32>>(state, id, |state, &()| state.keys().cloned().collect())
})
.with_query(FILE_NEWLINES, |query_ctx, id| {
mk_query(query_ctx, id, |query_ctx, &id| {
let text = query_ctx.get_text(id);
text.lines().count()
})
})
.with_query(TOTAL_NEWLINES, |query_ctx, id| {
mk_query(query_ctx, id, |query_ctx, &()| {
let mut total = 0;
for &id in query_ctx.get_files().iter() {
total += query_ctx.get_n_lines(id)
}
total
})
})
}
#[test]
fn test_number_of_lines() {
let mut state = State::new();
let db = salsa::Db::new(mk_queries(), state.clone());
let (newlines, trace) = get::<(), usize>(&db, TOTAL_NEWLINES, ());
assert_eq!(*newlines, 0);
assert_eq!(trace.len(), 2);
let (newlines, trace) = get::<(), usize>(&db, TOTAL_NEWLINES, ());
assert_eq!(*newlines, 0);
assert_eq!(trace.len(), 0);
state.insert(1, "hello\nworld".to_string());
let db = db.with_ground_data(state.clone());
let (newlines, trace) = get::<(), usize>(&db, TOTAL_NEWLINES, ());
assert_eq!(*newlines, 2);
assert_eq!(trace.len(), 4);
state.insert(2, "spam\neggs".to_string());
let db = db.with_ground_data(state.clone());
let (newlines, trace) = get::<(), usize>(&db, TOTAL_NEWLINES, ());
assert_eq!(*newlines, 4);
assert_eq!(trace.len(), 5);
for i in 0..10 {
state.insert(i + 10, "spam".to_string());
}
let db = db.with_ground_data(state.clone());
let (newlines, trace) = get::<(), usize>(&db, TOTAL_NEWLINES, ());
assert_eq!(*newlines, 14);
assert_eq!(trace.len(), 24);
state.insert(15, String::new());
let db = db.with_ground_data(state.clone());
let (newlines, trace) = get::<(), usize>(&db, TOTAL_NEWLINES, ());
assert_eq!(*newlines, 13);
assert_eq!(trace.len(), 15);
}
fn o_print<T: Hash>(x: &T) -> salsa::OutputFingerprint {
let mut hasher = DefaultHasher::new();
x.hash(&mut hasher);
let hash = hasher.finish();
salsa::OutputFingerprint(hash)
}
fn i_print<T: Hash>(x: &T) -> salsa::InputFingerprint {
let mut hasher = DefaultHasher::new();
x.hash(&mut hasher);
let hash = hasher.finish();
salsa::InputFingerprint(hash)
}
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